SW at her best (and is she's mad as hell too) and is defense ready (hands are up and shields ready) .
Fight in barren field on Earth.
1. Endgame Thanos (no IG) with sword and armor
2. Hela
3. Endgame Thanos (no IG) with sword and armor along with Hela
4. Thanos with incomplete IG (all except time stone).
5. Thanos (with same incomplete IG) and Hela.
6. Thanos (with full IG). SW has knowledge of how powerful and the capabilities of the IG
7. Thanos (with full IG) along with Hela. SW has knowledge of how powerful and the capabilities of the IG.
I'm assuming that she can be killed because Surtur killed her. Or maybe that was because Asgard fell? If so then yes she is on Earth and not Asgard. But we can assume that she starts off as powerful but leave the debate open to how long she can sustain damage (and blade creation) without being able to continually draw from Asgard. In case someone argues a battle of attrition then she doesn't have infinite power to continue to heal or create blades.
Disagree with me has nothing to do with what is being said here.
Either you did not watch the movie or you are committing a gross fallacy in logic.
You are asserting that SW was unable to kill Thanos in the movie (which had a particular reason why) and faulty equating that to the same happening here, when that particular reason doesn't exist here.
Then you stated some mess about her not being able to kill Thanos in the movie.
If you watched the movie then you would have clearly seen that Thanos was as good as dead until he got outside help to stop her from killing him.
So the 1st fight is a walk in the park for her. Thanos has no answer to her telekinesis (which is strong enough to break Thanos sword, which is strong enough to damage Cap's shield, etc).